US10985262B2 - Semiconductor structure and manufacturing method thereof - Google Patents
Semiconductor structure and manufacturing method thereof Download PDFInfo
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- US10985262B2 US10985262B2 US16/168,847 US201816168847A US10985262B2 US 10985262 B2 US10985262 B2 US 10985262B2 US 201816168847 A US201816168847 A US 201816168847A US 10985262 B2 US10985262 B2 US 10985262B2
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 239000000758 substrate Substances 0.000 claims abstract description 88
- 125000006850 spacer group Chemical group 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims description 58
- 238000005530 etching Methods 0.000 claims description 32
- 230000002093 peripheral effect Effects 0.000 claims description 23
- 239000003989 dielectric material Substances 0.000 claims description 10
- 150000004767 nitrides Chemical class 0.000 claims description 7
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 128
- 230000008901 benefit Effects 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- 239000011229 interlayer Substances 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/66007—Multistep manufacturing processes
- H01L29/66075—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials
- H01L29/66227—Multistep manufacturing processes of devices having semiconductor bodies comprising group 14 or group 13/15 materials the devices being controllable only by the electric current supplied or the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched, e.g. three-terminal devices
- H01L29/66409—Unipolar field-effect transistors
- H01L29/66477—Unipolar field-effect transistors with an insulated gate, i.e. MISFET
- H01L29/6656—Unipolar field-effect transistors with an insulated gate, i.e. MISFET using multiple spacer layers, e.g. multiple sidewall spacers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having at least one potential-jump barrier or surface barrier, e.g. PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic System or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/30—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26
- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
- H01L21/306—Chemical or electrical treatment, e.g. electrolytic etching
- H01L21/308—Chemical or electrical treatment, e.g. electrolytic etching using masks
- H01L21/3083—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane
- H01L21/3086—Chemical or electrical treatment, e.g. electrolytic etching using masks characterised by their size, orientation, disposition, behaviour, shape, in horizontal or vertical plane characterised by the process involved to create the mask, e.g. lift-off masks, sidewalls, or to modify the mask, e.g. pre-treatment, post-treatment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/70—Manufacture or treatment of devices consisting of a plurality of solid state components formed in or on a common substrate or of parts thereof; Manufacture of integrated circuit devices or of parts thereof
- H01L21/71—Manufacture of specific parts of devices defined in group H01L21/70
- H01L21/76—Making of isolation regions between components
- H01L21/762—Dielectric regions, e.g. EPIC dielectric isolation, LOCOS; Trench refilling techniques, SOI technology, use of channel stoppers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/04—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body
- H01L27/10—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being a semiconductor body including a plurality of individual components in a repetitive configuration
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/51—Insulating materials associated therewith
- H01L29/517—Insulating materials associated therewith the insulating material comprising a metallic compound, e.g. metal oxide, metal silicate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/40—Electrodes ; Multistep manufacturing processes therefor
- H01L29/43—Electrodes ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/49—Metal-insulator-semiconductor electrodes, e.g. gates of MOSFET
- H01L29/51—Insulating materials associated therewith
- H01L29/518—Insulating materials associated therewith the insulating material containing nitrogen, e.g. nitride, oxynitride, nitrogen-doped material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices adapted for rectifying, amplifying, oscillating or switching, or capacitors or resistors with at least one potential-jump barrier or surface barrier, e.g. PN junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
- H01L29/68—Types of semiconductor device ; Multistep manufacturing processes therefor controllable by only the electric current supplied, or only the electric potential applied, to an electrode which does not carry the current to be rectified, amplified or switched
- H01L29/76—Unipolar devices, e.g. field effect transistors
- H01L29/772—Field effect transistors
- H01L29/78—Field effect transistors with field effect produced by an insulated gate
- H01L29/785—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET
- H01L29/7851—Field effect transistors with field effect produced by an insulated gate having a channel with a horizontal current flow in a vertical sidewall of a semiconductor body, e.g. FinFET, MuGFET with the body tied to the substrate
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
- H10B12/02—Manufacture or treatment for one transistor one-capacitor [1T-1C] memory cells
- H10B12/05—Making the transistor
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10B—ELECTRONIC MEMORY DEVICES
- H10B12/00—Dynamic random access memory [DRAM] devices
- H10B12/01—Manufacture or treatment
- H10B12/09—Manufacture or treatment with simultaneous manufacture of the peripheral circuit region and memory cells
Definitions
- the present invention generally relates to a semiconductor structure and a manufacturing method thereof, and particularly to a semiconductor structure having a large pitch between adjacent gate structures and the manufacturing method thereof.
- Dynamic random access memory is a common volatile memory, which is comprised of multiple memory cells. Each memory cell is mainly comprised of a transistor and a capacitor controlled thereby, and each memory cell is electrically connected to each other by a word line and a bit line.
- the capacitor is electrically connected to the source/drain region of the transistor through a contact disposed in an inter-layer dielectric layer.
- the contact penetrates through the dielectric layer between adjacent transistors in the memory cell array to connect to the substrate.
- the present invention provides a semiconductor structure, wherein the adjacent gate structures have a large pitch therebetween.
- the present invention provides a manufacturing method of semiconductor structure for manufacturing the semiconductor structure.
- the method of manufacturing the semiconductor structure of the present invention includes the following steps.
- a substrate having a memory region and a peripheral region is provided, wherein the substrate in the memory region has a first dielectric layer thereon and the substrate in the peripheral region has a second dielectric layer thereon.
- a plurality of first gate structures are formed on the first dielectric layer.
- At least one second gate structure is formed on the second dielectric layer.
- a third dielectric layer is formed on the substrate, and the third dielectric layer covers the substrate, the first dielectric layer, the first gate structure, the second dielectric layer and the second gate structure. Portions of first dielectric layer and the third dielectric layer on the substrate on both sides of the first gate structure are removed to form first spacers on the sidewalls of the first gate structures, and form first dielectric structures.
- the first spacers on the sidewalls of the first gate structures and a portion of the first dielectric structures are removed.
- a fourth dielectric layer is formed to cover the second gate structure, second dielectric layer, the substrate, the first dielectric structures, and the first gate structures.
- a portion of the fourth dielectric layer on the substrate in the memory region is removed to form second spacers on the sidewalls of the first gate structures and the sidewalls of the first dielectric structures.
- the semiconductor structure of the present invention includes a substrate, a plurality of gate structures, a plurality of dielectric structures, and spacers.
- the plurality of gate structures are disposed on the substrate.
- the plurality of dielectric structures are respectively disposed between each of the gate structures and the substrate, wherein a top width of each of the dielectric structures is less than the bottom width of each of the dielectric structures.
- the spacers are disposed on sidewalls of the gate structures and sidewalls of the dielectric structures.
- the method of manufacturing the semiconductor structure of the present invention includes the following steps.
- a substrate having a first dielectric layer thereon is provided.
- a plurality of gate structures are formed on the first dielectric layer.
- a second dielectric layer is formed on the substrate, wherein the second dielectric layer covers the substrate, the first dielectric layer and the plurality of gate structures.
- Portions of the first dielectric layer and the second dielectric layer on the substrate on both sides of the plurality of gate structures are removed to form first spacers on the sidewalls of the gate structures, and form dielectric structures.
- the first spacers on the sidewalls of the gate structures and a portion of the dielectric structures are removed.
- a third dielectric layer is formed to cover the substrate, the first dielectric structures and the plurality of gate structures.
- a portion of the third dielectric layer on the substrate is removed to form second spacers on the sidewalls of the gate structures and the sidewalls of the dielectric structures.
- the size of the dielectric structure located between the gate structure and the substrate is reduced through an etching process, such that the adjacent gate structures have a large pitch therebetween to increase the area of the exposed surface of the substrate, thus facilitating the connection of the contact to the substrate.
- FIG. 1A to FIG. 1J are schematic cross-sectional views illustrating a manufacturing process of a semiconductor structure according to an embodiment of the present invention.
- FIG. 1A to FIG. 1J are schematic cross-sectional views illustrating a manufacturing process of a semiconductor structure according to an embodiment of the present invention.
- a substrate 100 is provided.
- the substrate 100 has a memory region 100 a and a peripheral region 100 b .
- the memory region 100 a is the region where a memory cell array is to be formed
- the peripheral region 100 b is the region where logic elements are to be formed.
- An isolation structure e.g. a shallow trench isolation structure
- the isolation structure in the substrate 100 is omitted for clarity and ease of illustration.
- a dielectric layer 102 is formed on the substrate 100 in the memory region 100 a , and a dielectric layer 104 is formed on the substrate 100 in the peripheral region 100 b .
- a plurality of gate structures 106 arranged in an array are formed on the dielectric layer 102
- a gate structure 108 is formed on the dielectric layer 104 .
- three gate structures 106 and one gate structure 108 are illustrated, but the disclosure is not limited thereto.
- the dielectric layer 104 may be used to form a gate insulating layer of a transistor in the peripheral region 100 b .
- the gate structure 106 includes a nitride layer 106 a , a conductive layer 106 b (e.g.
- the gate structure 108 includes a conductive layer 108 a (e.g. a polysilicon layer) and a mask layer 108 b (e.g. a nitride layer) sequentially stacked on the dielectric layer 104 , but the disclosure is not limited thereto. In some other embodiments, other types of gate structures may be formed depending on actual needs.
- the manufacturing methods of the dielectric layer 102 , the dielectric layer 104 , the gate structure 106 and the gate structure 108 are well known to a person skilled in the art, and details are not described herein again.
- a dielectric layer 110 is formed on the substrate 100 .
- the dielectric layer 110 covers the dielectric layer 102 , the gate structures 106 , the dielectric layer 104 and the gate structure 108 .
- the dielectric layer 110 is conformally formed on the substrate 100 , and may be served as a protective layer of the gate structures 106 in a subsequent etching process.
- the dielectric layer 110 includes an oxide layer, for example.
- the forming method of the dielectric layer 110 includes a chemical vapor deposition process, for example.
- an oxide layer may be in-situ formed as the dielectric layer 110 without performing a chemical vapor deposition process, so as to simplify the process steps.
- the dielectric layer 102 , the dielectric layer 104 and the dielectric layer 110 are all oxide layers.
- the dielectric layer 102 and the dielectric layer 110 may be formed to have the same or similar densities, while the dielectric layer 104 and the dielectric layer 110 have different densities.
- the dielectric layer 102 and the dielectric layer 110 may have the same or similar etching rate and may be removed simultaneously in a specific etching process.
- portions of the dielectric layer 102 and the dielectric layer 110 on the substrate 100 on both sides of the gate structures 106 are removed, so as to form spacers 114 on the sidewalls of the gate structures 106 , and form dielectric structures 116 between the gate structures 106 and the substrates 100 .
- a mask layer 112 is formed on the substrate 100 in the peripheral region 110 b .
- the mask layer 112 is a photoresist layer, for example.
- an anisotropic etching process is performed to remove the dielectric layer 102 and the dielectric layer 110 on the substrate 100 on both sides of the gate structures 106 with the mask layer 112 as an etching mask.
- the dielectric layer 102 and the dielectric layer 110 may be removed by a same etching process through adjusting the process parameters of the etching process.
- the disclosure is not limited thereto.
- the dielectric layer 102 and the dielectric layer 110 on the substrate 100 on both sides of the gate structure 106 may also be removed by different anisotropic etching processes.
- the dielectric layer 110 on the top surface of the mask layer 106 c is also removed during the etching process, so as to form the spacers 114 on the sidewalls of the gate structures 106 .
- the dielectric structure 116 is formed to have a cross-sectional shape similar to trapezoid, that is, the top width of the dielectric structure 116 may be less than that the bottom width of the dielectric structure 116 .
- the dielectric layer 110 by forming the dielectric layer 110 with a thickness as thin as possible (e.g. 2 nm to 3 nm), it is still possible to have a large pitch between the bottoms of adjacent gate structures 106 , so as to expose more surface of the substrate 100 , which is benefit for the connection of a contact formed subsequently to the substrate 100 .
- the thickness of the dielectric layer 110 is formed to be as thin as possible, therefore, not only the gate structure 106 may be protected from being damaged during the etching process, but also the dielectric layer 110 may be easily removed in a subsequent process.
- the mask layer 112 is removed. Thereafter, the remaining dielectric layer 110 (including the spacer 114 ) and a portion of the dielectric structure 116 are removed.
- the dielectric layer 110 on the entire substrate 100 is removed.
- the method of removing the dielectric layer 110 includes performing an isotropic etching process. In this way, the dielectric layer 110 in the peripheral region 100 b and the spacer 114 (formed by the dielectric layer 110 ) are both removed.
- the dielectric layer 104 and the dielectric layer 110 have different etching rates due to different densities. Therefore, the dielectric layer 104 is remained in the peripheral region 100 b .
- the dielectric layer 102 and the dielectric layer 110 have the same or similar density, therefore, a portion of the dielectric structure 116 is also removed during the etching process. As a result, the size of the dielectric structure 116 is reduced, and the area of the substrate 100 exposed between the bottoms of adjacent gate structures 106 is thus increased, which is benefit for the connection of a contact formed subsequently to the substrate 100 .
- a dielectric layer 118 is conformally formed on the substrate 100 .
- the dielectric layer 118 covers the substrate 100 , the gate structure 106 , the dielectric structure 116 , the dielectric layer 104 , and the gate structure 108 .
- the dielectric layer 118 includes a nitride layer, for example.
- the forming method of the dielectric layer 118 includes a chemical vapor deposition process, for example.
- a mask layer 120 is formed on the substrate 100 in the memory region 100 a .
- the mask layer 120 is, for example, a photoresist layer.
- An anisotropic etching process is then performed to remove of the dielectric layer 118 on the substrate 100 in the peripheral region 100 b and the underlying dielectric layer 104 with the mask layer 120 as an etching mask, so as to form a spacer 122 on sidewalls of the gate structure 108 , and form a gate dielectric layer 104 a between the gate structure 108 and the substrate 100 .
- the dielectric layer 118 on the top surface of the gate structure 108 is also removed during the anisotropic etching process.
- the mask layer 120 is removed.
- a dielectric material layer 124 is then formed on the substrate 100 .
- the dielectric material layer 124 includes an oxide layer, for example.
- the forming method of the dielectric material layer 124 includes a chemical vapor deposition process, for example. Since the memory region 100 a has the gate structures 106 arranged in an array, and the pitch between the adjacent gate structures 106 is narrow, the dielectric material layer 124 covers the dielectric layer 118 and fills in the space between the gate structures 106 . In addition, the pitch between the gate structure 108 and the surrounding components thereof in the peripheral region 100 b is greater, therefore, the dielectric material layer 124 is conformally formed on the substrate 100 in the peripheral region 100 b.
- a mask layer 126 is formed on the substrate 100 in the peripheral region 100 b .
- the mask layer 126 is a photoresist layer, for example.
- An isotropic etching process is then performed to remove the dielectric material layer 124 in the memory region 100 a with the mask layer 126 as an etching mask. Since the dielectric layer 118 (nitride layer) has been conformally formed on the substrate 100 in the memory region 100 a , the gate structure 106 and the dielectric structure 116 is prevented from being damaged by the isotropic etching process.
- the dielectric material layer 124 in the peripheral region 100 b is not affected by the etching process and thus the thickness thereof is not reduced, thereby facilitating the subsequent process.
- an anisotropic etching process is performed to remove a portion of the dielectric layer 118 with the mask layer 126 as an etching mask, so as to expose the surface of the substrate 100 , and form spacers 128 on the sidewalls of the gate structures 106 and the sidewalls of the dielectric structures 116 .
- the mask layer 126 is then removed, the manufacture of the semiconductor structure of the present invention is thus completed.
- processes well known to those skilled in the art, such as forming an interlayer dielectric layer, forming a contact, forming a capacitor, and other steps, may be further performed.
- the steps of forming the components in the memory region 100 a and the peripheral region 100 b may be integrated together, and the adjacent gate structures 106 may be formed to expose a larger area of the substrate surface therebetween, thereby facilitating the connection of the contact formed subsequently to the substrate 100 .
- the spacers 128 cover the sidewalls of the dielectric structures 116 , therefore, the dielectric structure 116 may be prevented from being damaged in subsequent processes.
Abstract
Description
Claims (16)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN201711082329.7 | 2017-11-07 | ||
CN201711082329.7A CN109755180B (en) | 2017-11-07 | 2017-11-07 | Method for manufacturing semiconductor structure |
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US10985262B2 true US10985262B2 (en) | 2021-04-20 |
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